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What factors affect the performance of defoamers?
Release Date:
2022-01-24
As is well known, defoamers play a crucial role in the coatings industry. After all, bubbles are inevitable during both production and application, and they can often lead to serious problems. But what happens when a defoamer is added to a formulation yet fails to deliver the expected defoaming effect?
As is well known, defoamers play a crucial role in the coatings industry, since bubbles are inevitable during both production and application. These bubbles can often lead to serious problems. But what happens when a defoamer is added to a formulation yet fails to deliver the expected defoaming effect?
Today, a defoamer manufacturer will introduce the factors that affect the performance of defoamers:
There are many factors that influence defoamers, at least two of which are:
1. The defoamer is solubilized by the surfactant,
2. The main component of the defoamer can be absorbed by the resin particles.
Defoaming performance under static conditions. When the bubble‑forming liquid returns to the storage tank or directly to the packaging container, rapid defoaming is also acceptable.
Defoaming performance of the defoamer under dynamic conditions:
1. Dynamic defoaming performance in relatively confined small spaces. Since gas enters the bubbles, a brief drop in external pressure further promotes bubble formation and stabilization. Wetting agents and emulsifiers exert a contracting effect on the gases within the bubbles—individually, this may seem insignificant, but when scaled up to tens or even hundreds of millions, the impact becomes substantial.
2. The open‑type dynamic defoaming effect: when a single‑sheet flexographic press is converted into a varnishing machine, the narrow gap between the adhesive roller and the ink roller is exposed to high‑speed rotation, causing bubbles to form very rapidly.
Machine applicability:
1. Temperature. Variations in temperature can alter the foam-stabilizing and defoaming properties of surfactants.
2. Customer habits.
No matter how we test the defoamer in‑house, it always passes; yet once it reaches the customer, it fails. We were baffled until, after visiting the site, we realized the issue: the customer was diluting it far more heavily. For a given dilution, the decline in foam stability of emulsifiers and wetting agents does not align with the reduction in the defoamer’s defoaming performance.
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